Light source spectrum and multispectral reflectivity image acquisition methods and apparatuses, and electronic device

Abstract

A light source spectrum acquisition method includes: acquiring a multispectral image, and determining a multispectral response value of each pixel in the multispectral image; reconstructing an RGB image according to the multispectral image; converting the RGB image into a grayscale image; and determining a target region in the grayscale image, wherein in the target region a grayscale value is less than or equal to a threshold, and calculating a light source spectrum response value according to multispectral response values of pixels of the multispectral image corresponding to the target region.

What is claimed is: 
     
         1 . A light source spectrum acquisition method, comprising:
 acquiring a multispectral image, and determining a multispectral response value of each pixel in the multispectral image;   reconstructing an RGB image according to the multispectral image;   converting the RGB image into a grayscale image; and   determining a target region in the grayscale image, wherein in the target region a grayscale value is less than or equal to a threshold, and calculating a light source spectrum response value according to multispectral response values of pixels of the multispectral image corresponding to the target region.   
     
     
         2 . The method according to  claim 1 , wherein a grayscale value corresponding to a pixel in the grayscale image is calculated according to three-channel values of a pixel in the RGB image. 
     
     
         3 . The method according to  claim 1 , wherein after the converting the RGB image into the grayscale image, the method further comprises:
 performing histogram statistics on the grayscale image to obtain a histogram statistical result, and determining the threshold according to interval parameters of a minimum value interval in the histogram statistical result.   
     
     
         4 . The method according to  claim 3 , wherein the determining the threshold according to interval parameters of the minimum value interval in the histogram statistical result comprises:
 determining the threshold according to an interval boundary value and a pixel proportion of the minimum value interval in the histogram statistical result.   
     
     
         5 . The method according to  claim 1 , wherein the calculating the light source spectrum response value according to the multispectral response values of pixels of the multispectral image corresponding to the target region comprises:
 calculating an average value of the multispectral response values of the pixels of the multispectral image corresponding to the target region to acquire the light source spectrum response value.   
     
     
         6 . A non-transitory computer-readable storage medium storing a computer program, where the computer program, when executed by a processor, causes the processor to perform the method of  claim 1 . 
     
     
         7 . The non-transitory computer-readable storage medium according to  claim 6 , wherein the method further comprises acquiring a multispectral reflectance image according to the multispectral response value of each pixel in the multispectral image and the light source spectrum response value. 
     
     
         8 . A multispectral reflectance image acquisition method, comprising:
 acquiring a multispectral image, and determining a multispectral response value of each pixel in the multispectral image;   reconstructing an RGB image according to the multispectral image;   converting the RGB image into a grayscale image; and   determining a target region in the grayscale image, wherein in the target region a grayscale value is less than or equal to a threshold, and calculating a light source spectrum response value according to multispectral response values of pixels of the multispectral image corresponding to the target region; and   acquiring a multispectral reflectance image according to the multispectral response value of each pixel in the multispectral image and the light source spectrum response value.   
     
     
         9 . The method according to  claim 8 , wherein a grayscale value corresponding to a pixel in the grayscale image is calculated according to three-channel values of a pixel in the RGB image. 
     
     
         10 . The method according to  claim 8 , wherein after the converting the RGB image into the grayscale image, the method further comprises:
 performing histogram statistics on the grayscale image to obtain a histogram statistical result, and determining the threshold according to interval parameters of a minimum value interval in the histogram statistical result.   
     
     
         11 . The method according to  claim 10 , wherein the determining the threshold according to interval parameters of the minimum value interval in the histogram statistical result comprises:
 determining the threshold according to an interval boundary value and a pixel proportion of the minimum value interval in the histogram statistical result.   
     
     
         12 . The method according to  claim 8 , wherein the calculating the light source spectrum response value according to the multispectral response values of pixels of the multispectral image corresponding to the target region comprises:
 calculating an average value of the multispectral response values of the pixels of the multispectral image corresponding to the target region to acquire the light source spectrum response value.   
     
     
         13 . An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, is configured to perform operations comprising:
 acquiring a multispectral image, and determining a multispectral response value of each pixel in the multispectral image;   reconstructing an RGB image according to the multispectral image;   converting the RGB image into a grayscale image; and   determining a target region in the grayscale image, wherein in the target region a grayscale value is less than or equal to a threshold, and calculating a light source spectrum response value according to multispectral response values of pixels of the multispectral image corresponding to the target region.   
     
     
         14 . The electronic device according to  claim 13 , wherein a grayscale value corresponding to a pixel in the grayscale image is calculated according to three-channel values of a pixel in the RGB image. 
     
     
         15 . The electronic device according to  claim 13 , wherein after the converting the RGB image into the grayscale image, the operations further comprise:
 performing histogram statistics on the grayscale image to obtain a histogram statistical result, and determining the threshold according to interval parameters of a minimum value interval in the histogram statistical result.   
     
     
         16 . The electronic device according to  claim 15 , wherein the determining the threshold according to interval parameters of the minimum value interval in the histogram statistical result comprises:
 determining the threshold according to an interval boundary value and a pixel proportion of the minimum value interval in the histogram statistical result.   
     
     
         17 . The electronic device according to  claim 13 , wherein the calculating the light source spectrum response value according to the multispectral response values of pixels of the multispectral image corresponding to the target region comprises:
 calculating an average value of the multispectral response values of the pixels of the multispectral image corresponding to the target region to acquire the light source spectrum response value.   
     
     
         18 . The electronic device according to  claim 13 , wherein the operations further comprise acquiring a multispectral reflectance image according to the multispectral response value of each pixel in the multispectral image and the light source spectrum response value.